Setting mechanism for saw-mills



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Patented May 9, 1882'.

Lmf'luul- "Wmesses N. PETERS, Pmwlnhagmpher. washmgmn. u. C.

(No Model.) 2 sneet-sneeta DE WITT 'C. PRESCOTT. u SETTING MEGHANISMPQR` SAW MILLS. 1

No;` 257,757'. V y Patented May 9,1882.

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. UMTED 'STATES PATENT l @miem DE WITT o.PR1`isoorT,i ou MARINETTE',wisconsin.

yseTTiue MECHANISM Fo'R SAW-MILLS.

SPECIFICATION forming part of Letters Patent-No. 257,757, dated May 9,1882.

i `Application filed February 18,1881. (No model.)

Taall whom it may concern:

Be it known that I, DE WITT C. Pnnsoo'r'r, aresident of Marinette, inthecounty of Marinette and State of Wisconsin, have invented certain newand useful Improvements in Setting Mechanism for Saw-Mills, which arefully Vset forth in the accompanying .speciiication,

reference being had to the aceompanyin gdrawings, in which- Figurelis anend elevation ot'a log-carriage 4and head-block with myimprovedsettingmechanism applied; Fig. 2, a plan view ot' the same, onlyso much of the carriage being shown as is necessary to illustrate thesettin g mechanism; Fig. 3, a detailed side elevation of the settingmechanism; Fig. 4, a transverse section ofthe same,taken on the lineyy,Fig. 3; Fig. 5, a lougitudi'nal section taken on the lineal,I x, Fig.2,lookingV from the inside; Fig. 6, a transverse section taken on the linez z, Fig. 5; Fig. 7, a detached view of the spring-pawl mechanism on anenlarged scale; Fig. a plan view of the saine and Fig. 9, a `transversesection taken on the line o o, Fig. 3,showing the shipping mechanism.

VMy invention relates to setting mechanism for adjusting the log on thecarriage as one piece after another is dropped by the saw, the

Vobject of my improvement being to provide mechanism for settingthe'knees on the headblocks transversely to the carriage with a ceratain and accurate graduation.

The invention consists in certain special mechanism and combinations ofdevices for accomplishing the above-stated purpose. The construction andoperation of this device will be hereinafter fully described, and thespecial improvements which itis believed are new, and which it isdesired to secure by Letters Patent, will be more definitely pointed outin the claims.

In the drawings, A represents the carriage, which is of any ordinaryconstruction, and B the' head-blockat one end of the carriage.

Aknee,G,of common construction,is mounted on the head-block and arrangedto slide thereon transversely to the carriage in the usual Way, suitableways being provided for this movement.

r'lhekneeon the head-block is moved back and forth by a screw-shaft, D,carrying on its outer end a beveledpinion, d.` A four-inch pitch. ispreferably given to the screw-thread Von this shaft, though I do notlimit myself to this preciseconstruction.

The beveled pinion cl mesheswith asimilar pinion, o, on the end of themain setting-'shaft E; which runs lengthwise of the carriage,jbe ingmounted in suitable bearings at the side thereof.

A pawl-carrier, F, is secured to the shaft E a short distance in frontof the head-block. ln the drawingsit is showniastened to the shaft by akey,f, or any other suitable device may be employed.

On the rear sido of'the pawlholder'is a' ratchet-wheel, G, and onthefrout sidethereof is a similarwheel, H. Both of these wheels,

which are mounted loosely on the shaft, are cap-shaped and arranged toinclose the pawl-` carrier, and are provided with intern alrat-chetteeth, g h.

-A pawl, I, is `pivotedto theface of the pawlcarrier, being arranged Aonthe back portion thereof so as to engage wi th the ratlchetteeth of thewheel Gr, as shown in Fig. 6 ofthe drawings. A portion of the width ofthis pawl, on theinside thereois extended back of the pivot to" form atail-piece, i. i

A sui'able spring, z", is arranged in a socket, ilnnderneath the outerend ofthe pawl to cause it to engage with the ratclietfwheel.

A similar pawl, J, is mounted in the same way onthe opposite side of thepawl -holder and arranged to engage with the ratchet-teeth ot' the WheelH. It is providedwith. a tailapi'ecc, j,and a spring, j', within asocket, j`2,jin precisely the same way as the pawl I.

The tails ot' the two pawls extend. backward side by side, as shown inFig.. S of the: draw.-

ings, and directly underneath them is a vec tical socket,f', in thepawl-holder, with in which is placed a loose pimf?, the head of which,at the upper end, is sufficiently large. to extend directly underneaththe tails ot' both `pawls. The lower end of this pin enters alongitudinal groove, e, in the shaft E, and in this groove is fitted aslide, K, the inner end of which is beveled and passes underneath thelower end ofthe pin, as shown in Fig. 5 of the drawings.

This slide passes out beyond the hub of the` wheel G, and is providedwith a collar, 7c, at-

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tached to its outer end andiarranged to slide on the shaft, beingprovided with an annular groove, 7c.

A vibrating frame or toggle, L, is mounted in suitable bearings on thecarriage-frame directly opposite the ratchet-wheels, so as to have afree vertical vibration. rlhis frame is branching, having an outside armon each side extending toward the ratchet-wheels', the rear one,l,beinghigher than the forwai d one, l. It isalso provided with a central arm,Z2, which is wider than the others and extends t'rom the plane ot' oneto the plane ot' the other.

On the under side of the ratchet-wheel Ll is a lug, h', and a pitman orconnecting-rod, M, is pivoted at one end to this lug and at the othertothe lower arm, l',the pivoted part runningfrom the latter to the lowerportion ot' the central arm, l2.

. A similar lug, g', is provided on the upper portion .of the wheel G,and a connecting-rod or pitman,N, is pivoted at one end to' this lug andat the other to the upper arm, I, being also connected in asimilar wayto thecentral arm` 2.

A hand-lever, O, is fastened in any suitable .way to the ratchet-wheelH, and just in trout of 'it is arranged an arc, l. This arc is supported at its outer end by the shaft E, being mounted by a sleeve, p, ontire outer end ot' the hub of the'wheel H.

The inner end of the arc is extended to the .frame in a web and may becast 'in one piece with the plate forming bearings for the vibratingtoggle, or may be made separately, it desired.

The face of the arc next the lever is pro- -videdwith a graduated scale,p, and a series of pins, p2, are arranged in sockets in the arc, so thatthey may be projected on this scaled face. Y

The lever 0 is set a little way from the are, andis provided with aspring stop, o, which rest-s against the graduated arc and is arranged.

-to strike against the stop-pins when one is turned out in its path. i`At the inner end of the arc is one pin which always remains projected,so as always to stop thelever at a certain point when turned inwardtoward the carriage.

A yoke or fork, Q., is attached to a vertical shaft, q, mounted in asuitable bracket on the `but in the opposite direction.

carriage-frame.

The yoke is arranged to embrace the collar 7c, as shown in Fig. 9 ot'the drawings, and the upper end of the shaft is provided with a handle,R, by means of which it may be oscillated, thereby moving the slide backand forth on the shaft.

.The operation of this mechanism is as follows: Obviously, whenever thelever O is vibrated, thereby oscillating the ratchet-wheel H, the toggleL will also be vibrated, thereby causing a similar oscillation ot thewheel G,

It is also evident that the inward oscillation of the wheels engages theteeth with the respective pawls,

thereby.communicating motion vt0 the shaft E, while on the outwardoscillation the teeth will slip over the pawls and the movement beineffective. Hence on the workin g oscillation of one ot' theratchet-wheels the other is moving idly. Now, the pins on the graduatedscale are so arranged relatively to the number ot' teeth on theratchet-wheels, the teeth on the gear-pinions, and thepitch of the screwthat they become indicating-stops to determine the precise movement ot'the lever in o rder to set the log for any required thickness of lumber,and the arrangen'ient is such that the move ment ot1 the lever in onedirection accomplishes one hal t' ot' the set and in the-other directionthe other halt'. For instance, preferably the lever is always in a stateof rest at its upper` point of vibration or against the permanentstop-pill, as sh'own in Fig. 1 of .the drawings. Now, when it is desiredto set the log the lever is pulled forward or outward until it strikesthe graduating-pin, thereby giving the wheel G an effective movement andturning the shaft E half the distance for the required set. Theleveristhenturned backinto itstirst position, reversing the movement ofthe ratchet-wheels, and causing .the wheel H to finish the set. Y

When it is desired to release the pawlsfor the purpose of reversing thesetting-shafts the slide K is thrust inward, thereby lifting the. loosepin and raising the tail-pieces of the pawls until the working ends ofthe latter are finally disengaged from the ratchets. The screw-shaft Dis provided with a haud-wheel,

S, for the purpose of accomplishing this reverse movement, it' desired.

I have described my setting mechanism ap plied to setting screws forreciprocating the knees, but I do notlimit myselfto this device, forobviously a rack and pinion may be substituted forthe screws with suchslightchanges in adaptation as will be obvious to any niechanic familiarwith mechanism of this kind.

l am aware that a single ratchetwheel and ldouble pawls have beenemployed iu setting mechanism, the wheel being t'astened to the shaft. 1

With my improvement I` am e'nahledto obtain a nice graduation and greataccuracy in the set, especially with the double movement of the leverrequired to make a full set. And my device also enables me to inclosethe ratchet mechanism, so that it is protected f rom obstructions andderangement.

The arrangement ot' the toggle-arms iu dit'- ferent places avoids alldanger of dead-points, so that the setting-lever is never stuck. It willbe understood ot' course that the carriage is provided with additionalblocks and knees, as may be required, the shaft E being provided vwithpinions en gagingwith similar pinions on IOC IOS

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ticulars'as described above, -for my improved device may be modified inmany details. without departing from my particular mode of constructionand operation.

I am aware of Letters Patent` No. 199,667, granted E. H. Stearns,`January 29, 1878, and I expressly disclaim all devices and combinationof devices shown and described in the said Letters Patent, restrictingmyself to the differences between my apparatus and that shown in thispatent and others of earlier date.V

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a setting mechanism for sawmills, the knees and connections, incolnbination with a pawl-carrier fastened to the shaft by which theknees are adjusted, two ratchet-wheels mounted loosely on the same shaftand sur- 2. The pawl-carrierF, mounted rigidly on the actuating-shaft,in combination with the ratchet-wheels G and H, mounted loosely on saidshaft and arranged around the carrier,

the pawls I and J on the carrier,.the vibrating toggle L, the pitmen Mand N, the knees C, and mechanism connecting the latter with the actuatin g-shaft,whereby the kn ees are adjusted by the movement ot' theshaft, substantially as and for the purposes set forth.

3. In a setting mechanism for saw-mills, the

ratchet-wheels Gr and H, mounted on the shaft from which motion iscommunicated to the adjustable knees, in combination with the pitlmen Mand N, the vibrating toggle L, constructed with sections in diiierentplanes, to each of which one of said pitmeu is connected, and anoperatinglever, substantially as and for the purposes set forth.

. 4. The actuating-shaft of a setting mechanism for saw-mills, incombination with a pawlcarrier rigidly attached thereto and providedwith suitable pawls, the ratchet-wheels mounted loosely thereon, thetoggle L, provided with the arms Z in different planes, and the centralweb-arm, Z2, and the pitmen M and N, substantially as described.

be lifted to turn the pawls on their pivots and disen gage them from theratchet-wheels, substantially as described.

6. The actuating-shaft of a setting mechan- 'ism for saw-mills, incombination with the pawl-carrier F, rigidly secured thereto, the pawlsI and J, mounted thereon and provided with tail-pieces t' j, the loosepin f2, arranged on the carrier underneath the tail-pieces of the pawls,the beveled slide K, arranged in a groove in the shaft, and mechanismfor reciprocating the latter, substantially as and for the purposes setforth.

,7. The actuating-shaft ofa setting mechanism for sawmills, incombination with the pawl-carrier F, rigidly secured thereto, the pawlsI J, mounted thereon and provided with tail-pieces ij, the springs ij,arranged in sockets in the carrier under the working ends of the pawls,the loose pin f2, arranged on the carrier underneath the tail-pieces ofthe pawls, and mechanism for raising said pin, substantially as and forthe purposes set torth.

S. In a setting mechanism for saw-mills, the knees and connections, incombination with-a pawl-carrier fastened to the shaf'tzby which theknees are adjusted, the two pawls mounted, on said carrier, the twoloose ratchet-wheels mounted on said shaft and surrounding the carrierand pawls, mechanism connecting the two ratchet-wheels, whereby theoscillation of one will canse the other to oscillate in the op positedirection, a lever for oscillating one ot'. the. ratchet-wheels, and agraduated series of stops, all arranged and operating, substantially asdescribed, to make halt' the set by the vibration of the lever in onedirection and the other half by its return movement, both thesemovements being determined by thev adjustment of thestops.

DE WITT C. PRESOOIT.

' Witnesses: Y

JN0. C. MACGREGOR, ALICE HOLLISTER..

